We flattened out the fibers and added some science to create a game-changing fabric that quickly pulls heat away from the skin-keeping you calm, cool, and crushing at max capacity. Fitted: Next-to-skin without the squeeze Iso-Chill fabric helps disperse body heat, making it feel cool to the touch Mesh back panel for ultimate breathability 4-way stretch construction moves better in every direction Material wicks sweat & dries really fast Anti-odor technology prevents the growth of odor-causing microbes Split back design can be worn open or tied up for a slimmer, more secure fit Reflective details for low-light runs Style #: 1361926 90% Polyester/10% Elastane Imported Machine wash cold with like colors Use only non-chlorine bleach when needed Tumble dry low Do not iron Do not use softeners